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3 years ago

How are muscles the contractile specialists of the body?

1 answer:

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Muscle cells are uniquely adapted to contractile function due to three main things. FIrst, they have a large capacity for storage of readily available glycogen to use for work. Second, they contain the actin and myosin cross-bridge cycling structure to perform a contraction of a muscle fiber. Finally, each fiber has central nervous innervation to control contraction and relaxation of the muscle fibers.

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What do humans, fish and all vertebrates have in common?

Mice21 [21]

Answer: They have a backbone

Explanation: Humans and fish are both vertebrates. Vertebrates are organisms with a backbone.

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3 years ago

Read 2 more answers

A client has presented to the radiology department for a scheduled bronchoscopy. What drug will meet the client’s needs for amne

skelet666 [1.2K]

Answer:

First, the options:

A. Midazolam

B. Ketamine

C. Nitrous Oxide

D. Bupivacaine

The ANSWER is A.

A. Midazolam

Explanation:

A. Midazolam✔

Midazolam is mainly used for amnesia or sedation in many diagnostic, therapeutic, and endoscopic activities or procedures.

B. Ketamine ❌

It has higher risk of side effects.

C. Nitrous oxide ❌

It won't be preferable for this case, since it can not be breathed in during a bronchoscopy.

D. Bupivacaine❌

This is solely for local anesthesia.

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3 years ago

In Humans, freckles are dominant to not having freckles.

Slav-nsk [51]

C 50%
Sorry I have to fill the rest with random characters djsjsndkjhsuxnshskshd

3 0

3 years ago

Mutations rII1 and rII2 are known to fall into the rIIA and rIIB cistrons (genes) respectively. Cells of E. coli B are infected

viktelen [127]

Answer:

the answer is A. E. coli B

Explanation:

The multiplicity of infection (MOI) refers to the ratio between the numbers of viruses used to infect E. coli cells and the numbers of these E. coli cells. Benzer carried out several experiments in order to define the gene in regard to function. Benzer observed that E. coli strains with point mutations could be classified into two (2) complementary classes regarding coinfection using the restrictive strain as the host. With regard to his experiments, Benzer observed that rII1 and rII2 mutants (rapid lysis mutants) are complementary when they produce progeny after coinfect E. coli K (where neither mutant can lyse the host by itself). The rII group of mutants studied by Benzer does not produce plaques on E. coli K strains that carry phage λ (lysogenic for λ), but they produce plaques on E. coli B strains. This study showed that rIIA and rIIB are different genes and/or cistrons in the rII region.

3 0

3 years ago

In a certain plant, tall stems (t) are dominant to short stems (t). a farmer crosses a short-stemmed plant with a heterozygous l

melisa1 [442]

The answers would be:

Genotype Phenotype

Tt Tall stemmed

tt Short stemmed

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2 or 1:1

You can read on to see how this was done:

Tall stems (T) are dominant to short stems (t).

First figure out the genotypes of the parents. We have a short-stemmed plant and a heterozygous long-stemmed plant cross.

For short stem to occur, you need 2 pairs of short alleles. So the first parent would have a genotype of tt.

Heterozygous long-stemmed means that the parent has one of each allele. So the genotype of the second parent would be, Tt.

Now we can make our Punnett Square.

tt x Tt

t t

T | Tt | Tt

t | tt | tt

Let's list down the genotypes and phenotypic results.

Genotype no. Phenotype

Tt 2 Tall stemmed

tt 2 Short stemmed

So from that we can answer the other questions:

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2 or 1:1

8 0

3 years ago