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Oxana [17]
3 years ago
5

1. A 2.B 3.C 4.D which one is it?

Biology
1 answer:
xz_007 [3.2K]3 years ago
7 0

Answer:

B

Explanation:

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Which one of the following statements about the endomembrane system is correct?
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The correct answer is: Proteins that will be secreted from the cell are likely to be found in closed spaces bounded by membranes of the endomembrane system.  

The endomembrane system is a group of organelles and their surrounding membranes in eukaryotic cells (prokaryotic cell doesn’t have membrane enveloped organelles) that works together in order to modify, package, and transport lipids and proteins. It includes nucleus with its nuclear envelope, lysosomes, the endoplasmic reticulum (smooth and rough), Golgi apparatus but also plasma membrane around the whole cell. The endomembrane system does not include mitochondria, chloroplasts, or peroxisomes.

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The map below shows the temperatures in parts of North America on an average spring day.
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Answer: B

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2 years ago
The visual system tends to divide an object into parts by "cutting" it at _______ in its silhouette.
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Concavity a is a shape that curves or bends inward. concave shape, incurvation, incurvature.

The concavities (valleys) is the visual system tends to divide an object into parts by "cutting" it at blank in its silhouette.

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A form of diffusion in which the molecules pass through a protein instead of between the phospholipids is called ________.
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2 years ago
Determine whether each statement describes mitosis, meiosis, or both mitosis and meiosis.
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Occurs in  organisms that  sexually reproduce ==> Occurs in meosis.

Meiosis is a type of gamete-specific nuclear division.

Meiosis occurs during spermatogenesis and oogenesis (egg formation in women).

In order for the number of chromosomes, characteristic of the species, to be conserved, it is necessary that before the encounter, the number of chromosomes of each of the reproductive cells be divided by two.

The reduction in the number of chromosomes takes place during the phenomenon called "meiosis".


Occurs during  growth and  development ==> It concerns mitosis.

Mitosis will ensure the good fulfillment of several phenomena:

. embryonic development,

. the general growth of organisms from birth to adult size,

. continued growth of certain organisms and / or organs; for example, trees, hair, teeth in ruminants, nails, ...


The DNA is  replicated ==> concern both mitosis and meiosis.

The cell cycle of eukaryotic cells is as follows:

• Interphase (normal functions, DNA replication)

G1 - growth / cellular activity

S - DNA synthesis / replication

G2 - preparation for division

• Phase M (cell division): which consists of either mitosis or meiosis, depending on cell types.

• Cytocinesis (cytoplasmic division).

So whether it is mitosis or meiosis, both are preceded by a replication of the genetic material (DNA)


Occurs in  all organisms ==> concern both mitosis and meiosis.

An organism is a set of elements that make up a functional structure.

In biology, the term organism designates a living being as it is organized, that is to say composed of different organs or organelles forming a coherent whole (as opposed to micro-organisms).

All multicellular organisms have sexual reproduction, so their cells are systematically mitosis and meiosis.

We exclude microorganisms of which a very small part of them have asexual reproduction.


The number of  chromosomes  remains the same : concerns only mitosis.

During mitosis, the human cell has 2n monochromatid chromosomes. In phase S consists of a doubling of the amount of DNA indeed, and the cells then have 2n chromosomes bichromatidiens. In the metaphase of mitosis, the chromosomes of the mother cell are arranged on a "metaphase plate", then split in 2-chromosomes, but monochromatids, during anaphase. Each daughter cell therefore has 2n monochromatid chromosomes.



The number of  chromosomes  reduces by half ==> Concerns only meiosis

Meiosis unfolds in two stages:

* The first meiotic division is called reductional because it allows to pass from 2n double chromosomes to n double chromosomes.

* The second is called equational because it preserves the number of chromosomes: one passes from n double chromosomes to n simple chromosomes.

Meiosis thus allows the formation of 4 haploid daughter cells (or gametes).

In humans, a normal cell contains 2n = 46 chromosomes (thus 23 pairs) while a gamete contains n = 23 chromosomes in two divisions).

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3 years ago
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