Amino acids are linked onto a polypeptide chain by ribosomes. What carries free amino acids to the ribosomes?
a. mRNA
b. tRNA
c. microRNAs
d. rRNA
e. any form of RNA
b
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Beta interferon is used to treat
a. herpes infections. b. multiple sclerosis. c. measles. d. mumps. e. hepatitis C.
You are studying two linked genes that influence vine height and fruit color in squash. Yellow color is dominant over green, and tall height is dominant over short. You get the following numbers of offspring from your testcross: 198 Tall Yellow, 192 Short Green, 54 Tall Green, and 56 Short Yellow What is the distance between these genes?
a. They are unlinked b. 11.2 cM c. 22 cM d. 78 cM
Most of the wood of a tree trunk consists of
A. vascular tissue. B. collenchyma tissue. C. sclerenchyma tissue. D. dermal tissue. E. parenchyma tissue.
The stimulus for secretion of neurotransmitters into the synaptic cleft is an increase in
A) potassium levels. B) chloride levels. C) sodium levels. D) calcium levels. E) neurotransmitter levels.