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Ainat [17]
3 years ago
11

Most bacterial cells have a cell membrane and a cell wall.. true or false

Biology
1 answer:
Doss [256]3 years ago
4 0
Bacterial cells lack a membrane-bound nucleus. A cell wall is found in bacteria, plants, fungi, algae, etc...
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What are the three inference (conclusions) Darwin made based on his observations?
Aleksandr [31]

Answer:

1. A Struggle for Survival

2. survival will reproduce

3. Superior adaptive variation

Explanation:

1. Observation: overproduction of offspring that can possibly survive.

CONCLUSION: A Struggle for Survival, most of this offspring fight for food and water.

2. Observation: variation in species: member of the same species have different ways of identification, which are color, sex, e.t.c

CONCLUSION: Those individuals that survive and reproduce do so in consequence  of "superior adaptive variation" (they are "more fit")

3. Observation: Variation heritable through selection: most survival pass there favourable adaptation to their offspring.

CONCLUSION:  Superior adaptive  variation will be passed on to offspring generation.

     

reference: https://www.mun.ca/biology/scarr/4250_History_II.html

6 0
3 years ago
Which of the following lymph nodes can be palpated when they're normal size?
lions [1.4K]
I believe the correct answer from the choices listed above is the last option. The lymph <span>nodes that can be palpated when they're normal size are </span><span> inguinal and popliteal. Hope this answers the question. Have a nice day.</span>
5 0
3 years ago
Read 2 more answers
Stress is most likely to speed the progression from hiv to aids by
creativ13 [48]

Answer:

Option D, inhibiting the production of lymphocytes

Explanation:

Options for the question are -

A.slowing the shortening of telomeres.

B.accelerating the production of NK cells.

C.stimulating the release of endorphins.

D.inhibiting the production of lymphocytes.

Solution

Acquired immune deficiency syndrome (AIDS) is an acquired immune deficiency syndrome cause by human immunodeficiency virus (HIV) infection.  

CD4+ T lymphocyte is an essential part of in immune responses and an HIV  attacks on the immunity of an individuals by killing CD4+ T lymphocyte.  

In general, out of total T lymphocytes , there are nearly  65% of CD4+ T lymphocytes a healthy individual. The remaining T lymphocytes are CD8+ T lymphocytes

An HIV infected person, has damaged  body's immune system leading to decrease in number of CD4+ T lymphocyte as of hampered CD4+ T lymphocyte production.  

Hence, option D is correct

5 0
4 years ago
What are three different shapes, or structures, of carbon-based molecules?
alexira [117]
The answer is straight chain, branched chain and ring. The straight chain is called pentene. Branched chain is the hexane. While the ring is Vanillin. Pentene is a colorless flammable liquid with several isomers. Vanillin is a white crystalline solid.Hexane is an organic compound used as solvent.
8 0
3 years ago
Which VERY important process MUST occur prior to cell division and why?
jarptica [38.1K]

Answer:

DNA Replication must occur prior to cell division because DNA carries the coding or instructions for all cell function.

3 0
3 years ago
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