Sperm production is called ____
a. parthenogenesis
b. spermatocytosis
c. oocytosis
d. oogenesis
e. spermatogenesis
ANSWER: e
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Examine this electron micrograph of a chloroplast.
a. Identify the stack of membranes labeled A. b. Identify the region labeled B. c. Would the production of organic compounds during the light-independent reactions occur in region b or on the membranes labeled a? d. Would you expect the plant in which this structure was found to have been illuminated with strong light immediately before it was prepared for electron microscopy? Why or why not?
Which is not true of the cytoplasmic membrane?
A. It defines the boundaries of the cell. B. It is a semipermeable barrier. C. It consists mainly of a fixed, static, phospholipid bilayer. D. It uses proteins as selective gates and sensors. E. All of the choices are true.
Which statement about the B cells' abilities to produce antibodies is most accurate?
A) There are no B cells until an antigen is encountered. B) Most B cells are capable of producing any kind of antibody. C) B cells wait to encounter an antigen and then copy it. D) There may be 100 million different B-cells, each producing a different antibody. E) B cells don't produce antibodies until they develop in the thymus.
Select the concepts emphasized by Ernst Mayr's biological species concept. Check all that apply.A) Hybridization between different speciesB) Production of fertile offspring within the speciesC) Populations in zoosD) Reproductive isolation from other species
What will be an ideal response?