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
The asymmetrical appearance of Mira, an oscillating variable star.
A medical assistant should present a neat appearance and make it a habit to wear a smile.
Four Possibilities in Judging the Presence or Absence of a Stimulus
Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus
Student Test Scores versus GDP per Capita
A sample of work by a Grade 4 student with a specific learning disorder