What is the function of the cremaster muscle?
A. It is the path through which sperm leave the body.
B. It opens the cervix during childbirth.
C. It is responsible for clitoral erection.
D. It moves the testes to or away from the body
D. It moves the testes to or away from the body
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Which of the following explains why the human population has so many phenotypic differences?
A. The majority of our genome consists of noncoding DNA. B. The majority of our genome consists of DNA that codes for proteins. C. Recombination allows for new genetic combinations. D. The genes that code for what we look like are more susceptible to mutation than other genes. E. None of the answer options is correct.
How do restriction enzymes work?
1.They recognize sticky ends and quickly restrict their binding. 2.They recognize and cut only specific sequences going backwards and forwards in the DNA. 3.They help to paste DNA from different organisms into cloning vectors. 4.They restrict plasmids from being taken up by host cells.
A short-lived contraction of the cells in a motor unit is known as a
a. muscle twitch. b. tetanus response. c. spasm. d. contracture. e. treppe.
How does fungal mitosis differ from animal mitosis?
A. Fungi only undergo meiosis, true mitosis is only found in animals. B. Cytokinesis only occurs in fungal mitosis. C. The nuclear envelope remains intact in fungal mitosis. D. The spindle apparatus is unique to fungal mitosis.