Which of the following is incorrect about blood cells?
A. They include glial cells.
B. They include leukocytes that are either granulocytes or agranulocytes.
C. They develop from undifferentiated stem cells.
D. After birth, they are produced in red bone marrow sites.
E. They include erythrocytes that, when mature, lose their nuclei.
Answer: A
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The ability to roll the edges of the tongue upward in a U-shape is considered to be an inherited trait. The standard assumption is that tongue-rolling is a dominant allele at a single gene locus. Which of the following would cast doubt on this assumption? Select all that apply.A) A student who can roll his tongue has both a mother and father who cannot.B) In a large research study, the majority of tongue-rollers were male.C) A research study with 1,000 participants reports that most non-tongue-rollers can learn to roll their tongues.D) A student who cannot roll his tongue has both a mother and father who can.
What will be an ideal response?
Which gland is associated with seasonal biorhythms?
A. Pineal B. Parathyroid C. Thymus D. Pituitary E. Thymus
Which of the following statements concerning tetanus is FALSE?
A) Its only source is from deep puncture wounds from rusty nails. B) Its toxin causes simultaneous contraction of both muscles in an antagonistic pair. C) It is a small, motile, obligate anaerobe. D) It produces a terminal endospore that gives the cell a distinctive "lollipop" appearance. E) Its diagnostic feature is characteristic muscle contractions, which are often noted too late to save the patient.
Sulfate-reducing bacteria produce
a. sulfite. b. calcium sulfate. c. hydrogen sulfide. d. iron pyrite.