Which of the following describes the earliest
protist found in the fossil record?
a. single-celled, free-swimming, asexual
reproduction, red alga
b. multi-celled, stationary, asexual
reproduction, red alga
c. multi-celled, free swimming, sexual
reproduction, red alga
d. multi-celled, stationary, sexual
reproduction, red alga
e. single-celled, stationary, asexual
reproduction, red alga
D
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Which of the following signalling proteins is specifically associated with development in animals?
A) Hedgehog B) Zbtb7 C) Ryanodine D) calcium-dependent protein phosphorylases E) protein kinase A
Both DNA and RNA can store information, yet DNA is the major information storage molecule in most cells. What are the advantages of using DNA for information storage instead of RNA? Select all that apply.
_____ DNA strands are more stable than RNA strands. _____ It frees up RNA for enzymatic functions. _____ DNA can make proteins directly and RNA cannot. _____ Reverse transcriptase could occur, allowing DNA to make RNA.
What is the response time for adaptive immunity?
a. 30 minutes b. 2-3 hours c. 5-7 days d. 6-9 months e. 12-24 hours
A pine seed consists of
a. the embryo. b. a female gametophyte. c. a seed coat. d. nutritive tissue. e. all of these.