The prime mover of wrist extension is the __________.
a. extensor carpi ulnaris
b. extensor carpi radialis longus
c. extensor carpi radialis brevis
d. extensor digitorum
Answer: d. extensor digitorum
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The production of red blood cells is regulated by a feedback loop involving erythropoietin. In non-disease states, the production of red blood cells is equal to the destruction of red blood cells, thus maintaining sufficient red blood cells to deliver adequate oxygen to the body's tissues. However, when the number of red blood cells decrease and oxygen levels are low, erythropoietin is produced by the liver and kidneys to increase the production of red blood cells. Is this a positive or negative feedback loop? Explain your answer.
What will be an ideal response?
In addition to penicillins, which group of antibiotics also exhibits a beta-lactam ring structure?
A) Trimethoprim B) Sulfonamides C) Cephalosporins D) Chloramphenicol
Helping other individuals at a reproductive cost to oneself might be adaptive if those helped are _____
Fill in the blank(s) with correct word
For the numbered steps below, select the option that places them in the correct order.
1) The ribosome binds to the mRNA and uses tRNAs to translate mRNA into the corresponding amino acid polypeptide sequence. 2) The spliceosome removes introns. 3) The primary structure of the polypeptide chain undergoes hierarchical foldings to form the tertiary structure. 4) RNA polymerase binds to the promoter region of a gene and initiates transcription. A) 1 > 2 > 3 > 4 B) 4 > 2 > 1 > 3 C) 3 > 1 > 4 > 2 D) 2 > 1 > 4 > 3