Which of the following scientists demonstrated
for the first time that molecules of life could
have come from nonliving entities (gases,
water, and spark discharge)?
a. Crick and Orgel
b. Wallace
c. Miller and Urey
d. Chargaff
e. Cuvier and Lyell
C
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"Seeds" of ancient lycophytes (existing over 300 million years ago) had which of the following characteristics? Select all correct choices
A. a haploid (1n) female gametophyte B. a diploid (2n) embryo C. a storage area for haploid (1n) male gametes D. a seed coat
Answer the following statements true (T) or false (F)
1. Stem cells have determinate cleavage. 2. Large differences in body form can result from only small differences of gene expression. 3. Radiata have neither an anterior end nor a posterior end. 4. All eumetazoans have cell junctions.
What is the genotype of the tall plant that has red flowers and wide leaves?
In peas, tall (T) is dominant to short (t), red flowers (R) is dominant to white flowers (r), and wide leaves (W) is dominant to narrow leaves (w). A tall plant that has red flowers and wide leaves is crossed to a short plant that has white flowers and narrow leaves. The resulting progeny are shown in the table.
A) T R W / t r w
B) T R W / t r W
C) T R W / T R W
D) T R W / T r w
E) T r W / t R W
If a cell contains chloroplasts, what type of cell must it be?
a. a prokaryotic cell b. a fungal cell c. a plant cell d. an animal cell