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3 years ago

Which of the following is a difference between food chains and food webs?

2 answers:

6 0

Both food chains and food webs contain plants and animals so it is not A.

Food chains separate by trophic level not food webs so it is not B

***Food chains show energy flow by each trophic level and food webs do not therefore it is C***

dedylja [7]3 years ago

5 0

Answer:

Option D, Food chains are linear, while food webs are complex.

Explanation:

A food chain is a linear organization in which the producer lies at the first stage followed by consumer organisms lying at primary, secondary and tertiary stages of food chain.

While in a food web, there can be several interlinked food chains or there can be an organism within the food web which is part of several food chains at an instance. Hence, the linearity of organization cannot be retained in case of food web thereby making it more complex than the food chain.

Hence, option D is correct.

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Which of the following is NOT a prokaryote?

GenaCL600 [577]

Answer:

<h2>Option B : Fungi</h2>

Explanation:

As,

Fungi is a eukaryote not a prokaryote

8 0

3 years ago

BIOLOGY NEED ANSWER ASAP

Hitman42 [59]

i would say [b]................

8 0

3 years ago

White feathers in canaries are dominant to yellow feathers. A heterozygous canary is crossed with a homozygous recessive canary.

Lera25 [3.4K]

2:4 homozygous recessive; 50% heterozygous.

Explanation:

I will be using the letter B to represent dominant alleles and b to represent recessive alleles.

If a canary is heterozygous, that means that it will have (Bb). Hetero, means different, so it will never be both (BB) or (bb).

If the other canary is homozygous recessive, it will be (bb). Homo, means the same, so it will never be (Bb). If the canary were homozygous dominant, it would be (BB).

I made a Punnett square to figure out the ratio and the percentage that is being asked in the question. As you can see, if you bring down the alleles from both of the parents accordingly, you will get...

2:4 of the offspring will be potentially homozygous recessive.

50% of the offspring will be heterozygous.

6 0

3 years ago

Explain at least three ways in which a mutation in an individual's DNA could occur, and describe at least 2 effects a mutation c

saul85 [17]

Answer:

Explanation:

Three ways in which mutation could occur are

1) If an error occurs during DNA replication and it's not corrected in time by DNA polymerase.

2) If there is a deletion of a base(s) in the sequence of the DNA. The deletion of a DNA nucleotide/base could also cause a mutation as that could affect the formation of an enzyme or protein useful in building and/processing certain body parts/processes.

3) Thymine dimerization: Thymine dimers are mutations that prevent DNA from replication or even transcription hence preventing a cell from undergoing division (hence causes cancer). They are formed when covalent bonds are formed between the bases of a DNA sequence (somewhere around the carbon-carbon double bond).

The two effects are

1) It could cause cancer as described in (3) above (in the case of thymine dimer)

2) It could lead to deformity in an individual because of the gene that is supposed to code for the last finger has a base deletion, that could eventually lead to the absence of that finger or a shorter or "strange" finger.

5 0

3 years ago

2) Which of the following is NOT one of the main components of the cell theory?

Tomtit [17]

The answers are A and C, But im not completely sure

5 0

3 years ago

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