This cellular structure lacks a membrane:

endoplasmic reticulum
chloroplast
nucleus
nucleoid
Golgi body


nucleoid

Biology & Microbiology

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The presence of which hormone in a mother's urine indicates that she is pregnant?

a. luteinizing hormone b. follicle-stimulating hormone c. human chorionic gonadotropin d. progesterone e. high estrogen

Biology & Microbiology

The end result of the process in Figure 20-1 is:


a. sympatric speciation.
b. allopolyploidy.
c. hybridization.
d. rapid speciation.
e. All responses apply

Biology & Microbiology

In Arabidopsis, the monopteros gene regulates:a

positional effects in leaves. b. the activity of the vascular cambium. c. the differentiation of wounded parenchyma cells into tracheids. d. apical-basal pattern formation. e. the location of the preprophase band.

Biology & Microbiology

Which structures are the water-conducting cells in mosses?

A) xylem cells B) vessel elements C) tracheids D) hydroids

Biology & Microbiology