If the nucleotide or base sequence of the DNA strand used as a template for messenger RNA synthesis is ACGTT, then what would be the sequence of bases in the corresponding mRNA?
TGCUU
UGCAA
ACGTT
GUACC
The Correct Answer is B
A. TGCUU: RNA does not contain thymine (T); it contains uracil (U) instead. The presence of thymine makes this option incompatible with proper mRNA synthesis.
B. UGCAA: Complementary base pairing rules state that adenine (A) pairs with uracil (U) in RNA, cytosine (C) with guanine (G), guanine (G) with cytosine (C), thymine (T) with adenine (A), and thymine (T) with adenine (A).
C. ACGTT: This is identical to the DNA template strand and not complementary. The mRNA strand must be complementary to the DNA template strand, not a direct copy of it.
D. GUACC: This sequence does not match the base-pairing rules for the given DNA template. It represents a mismatch in complementary pairing, making it inaccurate for mRNA transcription.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is A
Explanation
True:White fat primarily stores energy and provides thermal insulation, cushioning organs and helping regulate body temperature. Brown fat, rich in mitochondria, generates heat by burning lipids through non-shivering thermogenesis, especially important in infants and during cold exposure.
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