Each skeletal muscle cell constitutes a single
A. motor unit.
B. muscle fiber.
C. sarcolemma.
D. myofibril.
E. sarcomere.
B. muscle fiber.
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A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of _____
A) 120 adenine and 120 uracil molecules B) 120 thymine and 120 adenine molecules C) 120 cytosine and 120 thymine molecules D) 120 adenine and 120 cytosine molecules E) 120 guanine and 120 thymine molecules
Prokaryotes reproduce rapidly and this allows genetic variation to spread quickly through a population. Two processes can create new variations in prokaryotic populations. Select the choice with those two processes.
A. mutation and phage viral attack B. phage viral attack and genetic recombination C. genetic recombination and nondisjunction D. genetic recombination and mutation E. genetic recombination and rapid cell division
The oldest fossils on Earth are more than 3 billion years old
a. True b. False Indicate whether the statement is true or false
In this type of prenatal diagnosis, karyotype analysis can be performed as early as 8 weeks
A. Amniocentesis D. Pre-genetic diagnosis B. Chorionic villus sampling E. Polyploid analysis C. Cell-free fetal DNA analysis