Which of the following characters are considered analogous?
Answer : A bat wing and a bird wing
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A cyst formed by a protist functions
A. as a protective mechanism against adverse changes in the environment. B. in transfer from one host to the next. C. in repair of damage to the cell envelope. D. as a protective mechanism against adverse changes in the environment and in transfer from one host to the next.
Which of the following statements comparing hemidesmosomes with desmosomes is TRUE?
A. Hemidesmosomes are anchorage junctions but desmosomes are not. B. Hemidesmosomes interact with actin filaments while desmosomes interact with intermediate filaments. C. Hemidesmosomes anchor cells to the ECM while desmosomes anchor cells to other cells. D. Hemidesmosomes are found in plant cells while desmosomes are found in animal cells. E. Both hemidesmosomes and desmosomes associate with integrin, but not cadherin molecules.
Which of the following does NOT occur during the latent period of muscle contraction?
a. Myosin heads bind to actin filaments. b. Myofibrils shorten. c. Muscle cell membrane initiates an electrical impulse which travels into the muscle cell. d. Calcium is released from the sarcoplasmic reticulum. e. all of these
Which method is a statistical estimating technique used to determine the number of bacteria in a sample?
a) Turbidity b) Spread plate method c) Most probable number method d) Pour plate method