In a histology lab a scientist observes the following features under the microscope. Which of these
observations supports cell theory?
I. Cardiac cells are joined by gap junctions and contain three nuclei.
II. Mature platelet cells do not contain a nucleus, but do contain mitochondria.
III. Spermatogonia undergoing mitosis.
IV. The bulk of tissue samples from endocrine glands contain cells as their main building blocks.

Answers

Answer 1

option III and IV supports cell theory.

The three essential concepts of cell theory are that: 1. cells are the fundamental building block of life; 2. living creatures consist of one or more cells; and 3. cells originate from preexisting cells.

Hint #2 2 / 4

In cell theory, the quantity of nuclei is not taken into account.

Hint #3 3 / 4

A new cell is produced during the process of cell division known as mitosis. This idea—that cells form from already-existing cells—is exact.

Hint #4 4 / 4

III and IV are both illustrations of cell theory in the actual world. Mitosis, which is the process by which preexisting cells divide to form new ones, demonstrates how cells make up living things, as does the cellular makeup of glands.

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Related Questions

in order for an animal to gain mass what does it need?

Answers

Answer: Food

Explanation: Of course, animals need food in order to gain mass. The food is used to transfer into cells, forming tissues, skin, and muscle to the animal.

Hope this helped!

food, obviously. mass is how much something weighs or takes up space.

Blood from the brain drains into a large dorsal sinus called the ___________ ___________________. Blood
then travels through several other sinuses that join to form the ___________ ___________________, which
leave the skull and enter the neck.

Answers

Blood from the brain drains into a large dorsal sinus called the dural venous sinuses.  Blood then travels through several other sinuses that join to form the plexus which leaves the skull and enter the neck.

The cranial cavity's venous blood is drained by a set of blood vessels known as the dural venous sinuses. In order to sustain systemic circulation, it all returns deoxygenated blood from the head to the heart.

Between the two layers of the dura are endothelial-lined sinuses known as the dural venous sinuses (DVSs) (meningeal and endosteal layers). They bring venous blood to the internal jugular veins at the base of the skull from the brain, meninges, and calvaria. There are five unpaired dural sinuses (superior & inferior sagittal, straight, occipital, and intercavernous) and seven paired dural sinuses (transverse, cavernous, greater & lesser petrosal, sphenoparietal, sigmoid, and basilar).

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can be used by cells to store energy, form biological membranes, and serve as chemical messengers.
A.Lipids

B.Glucose

C.Carbohydrates

D.Fructose

Answers

The macromolecules that can be used by cells to store energy, form biological membranes, and serve as chemical messengers are lipids (Option A).

What are lipids?

Lipids represent a broad category of macromolecules composed generally by a glycerol backbone and one or more fatty acid chains, which may serve as hormones such as cholesterol.

In conclusion, the macromolecules that can be used by cells to store energy, form biological membranes, and serve as chemical messengers are lipids (Option A).

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8. Which situation is an abiotic factor for the habitat of coral organisms? *

Answers

Remember that corals thrive in the warm waters of the tropics.

Explanation:

hope this help you with your question

What is another possible analogy that could be compared with the structure and function of a cell?

Answers

Answer:

The structure and function of an air terminal and control tower are contrasted with the structure and function of a cell.

Explanation:

Androgens and estrogens are hormones that impact the sexual response cycle. Write about the four phases of that cycle and explain how the two types of hormones are involved.

Answers

Answer:

Females and males each have some amount of the sex hormones, androgens and estrogens. In males however, androgens like testosterone is more dominant and in females estrogens like estradiol are more dominant. The hormones both affect the sexual response cycle. The sexual response cycle has four phases: desire, arousal, orgasm and resolution. The desire phase can last anywhere from a few minutes to hours and includes physical changes like an increase in muscle tension, heartbeats quickening, flushed skin, and an increased flow of blood to genitals. The arousal phase extends to the brink of the orgasm phase, during this phase the changes experienced in the desire phase are intensified along with blood pressure increasing. The orgasm phase generally only lasts a few seconds and is the climax of the sexual response cycle, some characteristics include: Involuntary muscle contractions and spasms, blood pressure, breathing, and heart rate at their highest point, a release of built up sexual tension, and flushed skin. During the resolution phase the body returns to normal, often a sense of wellbeing and fatigue is achieved. To begin the cycle a male need a certain amount of the androgen, testosterone, but high levels in females tend to lead to more sexual thought and desires, typically though, women have relatively low levels of testosterone. In women, estrogens, such as estradiol are more common. Estrogens are produced when a girl starts puberty and helps her reproductive cycle begin. A high level of estrogen in men can lead to a reduced sex drive, loss of hair, or trouble focusing, but a normal level in men is crucial to proper erectile function.

Explanation:

I just submitted this i hope it helps lol :)

How big is your heart?​

Answers

Answer:

It's about the size of your fist (right or left doesn't matter)

The heart weighs between 7 and 15 ounces (200 to 425 grams) and is a little larger than the size of your fist.

which forms a new nebula
a. suspernova
b.black hole
c. neutron star
d. globular cluster

Answers

Answer:

a

Explanation:

This is owing to some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova

C is the answer but make sure it is before u submit

Which is not an example of a physical change in matter?
A. melted ice
B. rusting iron
C. popsicle

Answers

Answer:

b

Explanation:

the physical matter is not changing it is simply adding stuff also just believe me

G A A G C G A T C A G T T A C G
Now write the mRNA strand for the given DNA strand

Answers

Answer:

http://www.sheffield.k12.oh.us/Downloads/DNA_base_pairing%20activity.pdf

Explanation:

genotypes of two children with different parents are the same true or false

Answers

Answer:

Depening on the gentotyes the answer will be true

Explanation:

Producers campfire the carbon dioxide and convert it into glucose through the process of respiration, true or false

Answers

Answer:

true ..................

only a thesis accept the theory of evolution is it a fact or a fiction?

Answers

Answer:

Fact

Explanation:

evolution as fact and theory, a phrase which was used as the title of an article.

what is lack educatiom​

Answers

a situation when the general understanding of the population is below average with regard to requirements for everyday living.

A four-year-old tree with a woody trunk experienced optimal growing conditions during its first two years of growth and drought conditions during the most recent two years. Describe the relative width of the tree's four growth rings.

Answers

Answer:

First two rings are thicker while the last two rings are thinner.

Explanation:

Due to the first two years of optimal growing conditions received by the tree, the width of trunk of the tree is thicker but due to drought conditions experienced by the tree during the most recent two years, there is very little increase occur in the width of the trunk because the tree is in stress condition   and for that reason the ring of trunk is thinner as compared to first two years.

You are going on a space trip. You fly in a shuttle from Earth to Mars. You leave Mars and shuttle over to Saturn. On
which planet did you have the MOST mass?
(A) Jupiter
(B) Earth
Mars
(D) None. My mass did not change.

Answers

Answer:

Jupiter

Explanation:

I would say that because Jupiter already has a lot of mass on it and I would suspect that you would too.  But I am not sure if it is 100% right, so correct me if I am wrong! Have a nice day! :)

what is the level of organization of the organs from smallest to largest (brain, kidneys, heart, lungs, liver, stomach)?

Answers

Answer:

I think it might be Kidneys, liver, stomach, heart, brain, and lungs

Explanation:

I hope this is right im sorry if it is not, cause im just guessing kinda

how is food transferred

Answers

Answer:

In many cases, Western society routinely purchases food that was grown more than 1000 miles away and transported to the local grocery store. ... Trucks, trains, and boats, all of which consume fossil fuels, are the primary methods for transporting large quantities of food around the world

Explanation:

Which is the best definition of historiography?

determining a source’s reliability while collecting evidence
collecting objects remaining from a particular period in history
using the results of historical research to tell the story of history
investigating historical evidence including artifacts and document

Answers

Sjsjdjfkfirjrnfnfjfncncjfndjdndndndndnf

Answer:

using the results of historical research to tell the story of history. So C

Explanation:

sorry if i got it wrong, but i think its C

which type of cells will undergo mitosis.​

Answers

Answer:

eukaryotic cell...........only

Whereas somatic cells undergo mitosis to proliferate, the germ cells undergo meiosis to produce haploid gametes (the sperm and the egg). The development of a new progeny organism is then initiated by the fusion of these gametes at fertilization.

One advantage of the __________ model is quick recognition. A. prototype B. exemplar C. language D. concept

Answers

Answer:

A.

prototype

Explanation:

Answer:

A. Prototype

Explanation:

hope it helps :)

a. If your body does not take in protein, but only carbohydrates and lipids,
what atoms will it be missing? Hint: There are two, and you can figure this
out by comparing the structures of the monomers for proteins and
carbohydrates as well as the basic structure of lipids.

Answers

Answer:

The main two atoms missing when you do not eat protein is Nitrogen and Sulfur. Lipidsand carbohydrates contain Carbon, Hydrogen and Oxygen. Although protein does containCarbon, lipids and carbs do not contain Nitrogen and Sulfur. The main two atoms missing when you do not eat protein is Nitrogen and Sulfur

mRNA sequence is mutated from CCC GGG to CCG GGG. What type of mutation occurred? Select all that apply.
point mutation
silent mutation
indel
insertion
deletion
missense
nonsense mutation

Answers

Silent mutation and point mutation, the third C was turned into a G (point mutation) but this did not affect the amino acid it was supposed to code for (silent mutation)

If mRNA sequence is mutated from CCC GGG to CCG GGG, the mutation will be point and silent.

Point Mutation:

It is type of mutation in which only one nitrogenous base is exchanged with another one.  This can be silent if the codon resulting is coding for same amino acid.

Here, CCC codon mutate to CCG, the mutation occur at a single base, hence it is point mutation.

Since, both Codons code for the proline, hence mutation is a silent mutation.

Therefore, if mRNA sequence is mutated from CCC GGG to CCG GGG, the mutation will be point and silent.

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Answers

Answer: C

Explanation:

Which structure is found only in plant cells and functions in the process of photosynthesis?

Answers

Answer:

Chloroplasts are specialized organelles found only in plants and some types of algae. These organelles carry out the process of photosynthesis, which turns water, carbon dioxide, and light energy into nutrients from which the plant can obtain energy. There can be over one hundred chloroplasts in certain plant cells.

Explanation:

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Which model best summarizes the importance of solar energy for life on
Earth?
A. A consumer index
B. A food chain
C. The rock cycle
D. The carbon cycle

Answers

Answer- food chain

I’m doing the course and that was the answer

I got for the question

Describe the levels of cellular organization in an animal, and explain how organs work together as a system.

Answers

Answer:

Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive.

The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.

The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.

The survival of the organism depends on the integrated activity of all the organ systems, often coordinated by the endocrine and nervous systems.

Explanation:

Green pea plants are dominant. (G) Yellow pea plants are recessive. (g) What percentage chance is it that a yellow pea plant would come from one parent being green (Gg) and the other being Green (Gg).

Answers

Answer:

25%

Explanation:

if you set up a punnett square you'll get GG,Gg, Gg, and gg. only gg would be yellow so 25%

Tropical rainforests are viewed as rich in biomass productivity. Currently much of the trees in tropical forests are being cut down for establishing cattle ranches.

How thick or deep is the tropical forest O and A soil horizons?

*Give your best explanation of what natural processes are taking place to explain why this is the case* (the part I need help with mainly)

Answers

The tropical A Horizon has a intensity of 2-5cm thick, some distance much less than that of the A Horizon of temperate soils. In different soil types, the following layer, or B Horizon, consists normally of rocks.

Since there are few rocks withinside the Amazon, the B Horizon is typically tender sedimentary clay. This layer can also additionally amplify to 4km beneath the floor.The number one soil orders located in tropical rainforests are Oxisols and Ultisols, that are soils wealthy in iron and aluminum oxides (pink color) however with low herbal fertility.

The A-horizon is typically known as the topsoil, and usually tiers from 8-20 cm in thickness. It is a mineral horizon that shaped on the floor or beneath an O-horizon, and is characterised through an accumulation of humified natural rely in detail combined with the mineral fraction.

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Since DNA precipitates out in ethanol, is DNA soluble or insoluble in ethanol? Explain.

Answers

u don’t know i’m sorry
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