Which of the following organisms belongs to the Subphylum Cephalochordata?
a) hagfish
b) lamprey eel
c) sea squirt
d) lancelet
e) catfish
Answer: d) lancelet
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A(n) ________ mycelium is a branching network of fibers on and/or beneath the surface of the agar growth medium.
Fill in the blank(s) with the appropriate word(s).
Flight muscles of birds connect bones of the upper limb to the ________
a. pelvic girdle b. radius c. sternum d. ulna
Which of the following statements is NOT
correct about osmosis and plant cells?
a. Water tends to diffuse from soil into young plant cells, thus creating an osmotic pressure. b. Turgor pushes against the cell walls from the outside, so it keeps the cells plump. c. If the concentration of solutes becomes higher in the soil than in plant cells, water molecules will tend to diffuse out of plant cells. d. The cytoplasm of plant cells would typically contain more solutes than soil water. e. Osmosis is the diffusion of water molecules across the plasma membrane of plant cells.
What macroevolutionary concept is considered controversial by some people?
A) the appearance of new traits in existing populations B) the common descent of all organisms from one ancestral cell C) the concept of species being subdivided into separate populations D) the concept that genes can vary spontaneously