Which of the following is a kind of reproduction found only in freshwater sponges?
a. Fragmentation
b. Budding
c. A single individual producing both sperm and egg
d. The formation of gemmules
d. The formation of gemmules
The formation of gemmules is found only in freshwater sponges. They are clusters of cells surrounded by a tough outer layer, which helps them survive hostile environments and attach to a substrate and grow into a new sponge.
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This unit explored features that describe living organisms. Choose all that apply to living organisms from the following.
Stomata are:a
waxy layers that cover leaves. b. openings in the leaf epidermis. c. extensions of bundle sheaths. d. particularly numerous on the upper epidermis. e. guarded by two stipule cells.
Where do human nerve cells remain once they become mature and exit the cell cycle?
a. in G2 b. in G1 c. in G0 d. in S phase
Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Franklin B. Chargaff C. Hershey and Chase D. Meselson and Stahl E. Watson and Crick