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natima [27]
3 years ago
9

Which statement about the cell membrane is true?

Biology
2 answers:
Elina [12.6K]3 years ago
6 0

Answer: The correct answer is -

It prevents harmful substances from entering a cell.

Explanation:

Cell membrane is a selectively permeable, protective layer that is present surrounding the cytoplasm of all cells of living organisms. It allows the entry and exit of only certain substances

It does not allow the harmful substances to enter inside the cell and at the same time, the useful substances to exit the cell. Due to this, it is also known as selectively permeable membrane.

Thus, last option is the right answer.

Ahat [919]3 years ago
5 0
Your answer would be the third choice, C.
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Prior do the 1600s it was believed that all living things for either plants or animals. Which of these inventions led to the dev
Lostsunrise [7]

Answer:

The Microscope

Explanation:

Before the 1600s, every living thing was a part of a two kingdom classification system derivative of binomial nomenclature. This was proposed by Linnaeus, a Swedish Naturalist, who split all living things into either the animalia or plantae kingdom. After the invention of the microscope however, a new detailed classification system was put in order to accommodate for microscopic life. This new system recognizes the existence of 6 kingdoms: eubacteria, archaebacteria, prostista, fungi, plantae, and animalia.

6 0
3 years ago
You sampled 1000 individuals from a population of mosquitoes to test whether they are in Hardy-Weinberg Equilibrium for a gene D
Marysya12 [62]

Answer:

The population is not following the Hardy-Weinberg equilibrium.

Explanation:

Hardy-Weinberg  proposed that the population will remain in the equilibrium if they are not affected with the external natural force like genetic drift, mutation and many others. The gene pool of a population will remain in equilibrium state for generations.

The mathematical expression for the Hardy-Weinberg are

Genotypic frequency is p²+q²+2pq=1

Allele frequency is p+q=1

where p-dominant allele,

q-recessive allele

Therefore,calculating expected frequency of allele q,

q² (recessive genotype)-  q²+2pq/1000

= 22+188/1000

=210/1000

= 0.21

q= 0.45

Calculating expected frequency of allele p,

Using p+q=1

p=1-q

p= 0.55 (expected)

Calculating observed value of frequency of p,

p²= p²+2pq/1000

= 790+188/1000

= 978/1000

= 0.978

p = 0.988 (observed)

Since the expected frequency does not match the observed frequency therefore the population is not under the Hardy-Weinberg equilibrium and the gene pool is disturbed.

4 0
3 years ago
Which of these sentences characterizes the regulatory mechanisms of gene expressions in organisms?
Len [333]
The sentence “they save energy and metabolites and help the organisms to respond to the environmental changes” characterizes the regulatory mechanisms of gene expressions in organisms. The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.
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3 years ago
2) Why should you perform plyometrics?
Slav-nsk [51]

pylometrics increases muscle strength and can improve coordination, strength, & speed

6 0
3 years ago
How many mL of stock solution of 2M NaCl do you need to prepare 100 mL of 0.150M NaCl?​
zhuklara [117]

Answer:

7.5mL

Explanation:

3 0
3 years ago
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