Each hair grows in an oblique epithelial tube called a

bulb

vellus

hair root

pilus

hair follicle

Answer and Explanation

The Correct Answer is E

A. bulb: The bulb is the enlarged base of the hair where active cell division occurs, producing the hair shaft, but it is not the entire oblique epithelial tube.

B. vellus: Vellus refers to fine, pale hair covering most of the body in children and adult females. It describes the type of hair, not the structure in which hair grows.

C. hair root: The hair root is the portion of the hair beneath the surface of the skin, extending from the bulb to the point where the hair emerges, but it is contained within the follicle rather than being the whole tube.

D. pilus: Pilus is a general term for a hair shaft or hair in Latin, but it does not refer specifically to the oblique epithelial tube structure that surrounds hair growth.

E. hair follicle: The hair follicle is the oblique epithelial tube that surrounds the hair root and bulb. It anchors the hair into the skin and provides the environment for hair growth and regeneration.

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Correct Answer is C

Explanation

A. bind the hair root to the dermis:The hair root is anchored to the dermis by the hair follicle itself and connective tissue structures. The receptor does not play a role in binding or physical attachment of the hair root.

B. serve as a source for new epidermal cells for hair growth after the resting stage has passed:New epidermal cells for hair growth arise from the hair matrix at the base of the follicle. The root hair plexus is a sensory nerve ending, not a cell-generating structure.

C. allow the hair to assist in touch sensation:The hair follicle receptor, or root hair plexus, is a network of sensory nerve endings wrapped around the follicle. It detects movement of the hair, making hair an important component of the tactile sensory system.

D. cause apocrine gland secretion into the hair follicle:Apocrine gland secretion is controlled by hormonal and neural signals, but not by the root hair plexus. The plexus functions in sensation, not glandular stimulation.

A. TCG B. AUG C. UGA D. UCG

Correct Answer is D

Explanation

A. TCG:DNA contains thymine (T) instead of uracil (U), and transcription involves RNA pairing, not direct DNA-tRNA pairing. TCG in DNA does not directly base-pair with tRNA during translation.

B. AUG:AUG is a codon on mRNA that codes for methionine and serves as the start codon. tRNA with an AGC anticodon would not pair with AUG.

C. UGA:UGA is a stop codon on mRNA. An AGC anticodon cannot base-pair with a stop codon, as stop codons do not correspond to tRNA anticodons.

D. UCG:The tRNA anticodon AGC is complementary to the mRNA codon UCG. Base pairing occurs via A-U and G-C hydrogen bonds, allowing proper amino acid incorporation during translation.

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Each hair grows in an oblique epithelial tube called a

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Explanation

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Explanation

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