A student encounters a pondweed which, judging from its appearance, seems to be a charophyte. She brings a sample back to her biology lab. Using only a compound light microscope to study the sample, which of the following features should help her to determine whether the sample comes from a charophyte or from some other type of green alga?
1. molecular structure of enzymes inside peroxisomes
2. structure of sperm cells
3. presence of phragmoplasts
4. rings of cellulose-synthesizing complexes
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 1, 3, and 4
E) 2, 3, and 4
Female choice based on male appearance.
(A) Figure illustrating the location and appearance of a peptic ulcer in both the stomach and the du
Thymus gland. (A) Appearance and position; (B) with anatomic structures.
Hints of Earth’s Early Appearance
These illustrations show Ellen Craft, a slave with and without a disguise. She dressed “as a disting
School is over—but not for this student. After the regular school day, hundreds of thousands in ...