What type of cells are joined end-to-end, conduct water and are connected to each other with strips of wall material?
A. sieve cells
B. tracheids
C. sieve tube members
D. vessel members
E. companion cells
D. vessel members
Sieve cells, companion cells and sieve tube members are all part of the phloem, tissue that conducts food (sugar) materials throughout the plant. Tracheids and vessel members conduct water. Vessel members are cells that are joined end to end. Where two cells meet, they are connected by strips of cell wall material (called perforation plates). The gaps between these strips allows water to travel very efficiently through the plant.
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If Tp sperm are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus?
A) 2 B) 3 C) 6 D) 12
Assuming a single cross-over event, the completion of meiosis produces ____
a. three daughter cells with parental chromosomes and one daughter cell with a recombinant chromosome b. four daughter cells with recombinant chromosomes c. two daughter cells with parental chromosomes and two daughter cells with recombinant chromosomes d. one daughter cell with parental chromosomes and one cell with recombinant chromosomes e. two daughter cells, each with recombinant chromosomes
An infectious disease with occasional new cases reported in random locales at irregular intervals is said to be ____
a. sporadic b. endemic c. pandemic d. epidemic
What is the liquid interior of the chloroplast called?
A) centriole B) chromatin C) Golgi apparatus D) stroma