Calcium ions used for muscle contraction are stored in which part of the muscle cell?
a. the nucleus
b. the Golgi apparatus
c. the sarcoplasmic reticulum
d. the ribosomes
e. the lysosomes
C
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How many chromosomes would be found in the karyotype of a Down syndrome female?
A. 47 B. 45 C. 46 D. 44
As populations approach carrying capacity, crowding can affect:
A. birth rates through resource limitation. B. death rates through resource limitation. C. death rates by increasing the transmission of pathogens and parasites. D. birth and death rates through resource limitation. E. birth and death rates through resource limitation, and death rates by increasing the transmission of pathogens and parasites.
"Jumping genes" that have the ability to move within and between chromosomes are called
A. oncogenes. B. transposons. C. introns. D. retroviruses. E. exons.
Which of the following post-transcriptional modifications allow multiple forms of protein products from the same gene sequence?
A. phosphorylation B. methylation C. alternative splicing D. poly-A tail E. 5’ nucleotide cap