Which of these can found in oak wood but not in pine wood?  

A.  secondary xylem
B.  secondary phloem
C.  vessel members
D.  tracheids
E.  ray cells


C.  vessel members
The xylem of pine trees and other gymnosperms contains only tracheids. In comparison, the xylem of angiosperms, which includes flowering trees like oaks, has both tracheids and vessel members.

Biology & Microbiology

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Match the choice:

A) AMP B) cytosine C) quaternary structure D) ribonuclease E) monosaccharide F) guanine G) adenine H) amino acid I) steroids J) starch K) spatial structure L) collagen M) linear structure 1) monomer of protein 2) polymer of glucose 3) pyrimidine 4) nucleotide 5) multimeric complex 6) Haworth projection 7) an example of a globular protein

Biology & Microbiology

Which of the following is not one of the key adaptations that distinguish hominins from apes?

1.bipedal locomotion 2.opposable thumbs 3.upright posture 4.tool use

Biology & Microbiology

In an Rh incompatibility during pregnancy, the

mother a. must be positive and her first and second fetuses positive. b. must be negative and her first and second fetuses positive. c. must be negative and her first and second fetuses negative. d. must be positive and her first and second fetuses negative. e. and the father must both be negative and the fetus positive

Biology & Microbiology

The majority of infections with poliovirus are (asymptomatic/nonparalytic/paralytic).

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology