Which of the following animals undergoes rotational cleavage?
A. echinoderms
B. annelids
C. amphibians
D. mammals
E. reptiles
D. mammals
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Starting with shredded spinach leaves, you follow a procedure that allows for separation of cellular organelles. You are specifically looking for the fraction that contains the mitochondria. To identify this fraction, you should test for the
A) phospholipids unique to intracellular membranes. B) general presence of enzymes that fix carbon. C) phospholipids unique to the mitochondrial membrane. D) polysaccharides that specifically surround the mitochondria. E) presence of enzymes associated with cellular respiration.
You are explaining the biological basis of depression to a friend. The most accurate description is:
A. Depression stems from an irregularity in the production, release, reception, breakdown, or reuptake of neurotransmitters. B. Depression can be traced to myelin loss, which causes remarkable nerve dysfunction due to the slowing or blocking of nerve conduction. C. Depression is a cognitive disorder that involves a clinically significant deficit in cognition or memory that represents a marked change from a previous level of functioning. D. Depression is characterized by one or more symptoms of a physical dysfunction for which there is no identifiable organic cause.
Which of the following structure contains the cells genetic material ?
a. cytoplasm b. nucleus c. mitochondria
What is the basis of codominance?
A) There is only one allele for a gene. B) Each allele of a gene produces a protein that functions to create a trait. C) One allele of a gene encodes a protein, and the other allele is nonfunctional. D) One gene has many alleles. E) One allele can have many effects on a phenotype.