Which of the following correctly lists the six most abundant elements found in living organisms?
A. carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur
B. water, carbon, oxygen, nitrogen, phosphorus, sulfur
C. water, carbon, hydrogen, oxygen, nitrogen, salt
D. carbon, hydrogen, oxygen, carbon dioxide, nitrogen, salt
Answer: A
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Answer the following statements true (T) or false (F)
1. Abnormalities in the number of chromosomes, known as nondisjunction, are more common in younger parents. 2. Johann Gregor Mendel posited in his study on inheritance in plants that offspring exhibited an even blending of physical appearance and traits from parents. 3. This statement is false. Mendel posited in his study on inheritance in plants that offspring exhibited traits that are transmitted faithfully from parents to offspring in specific patterns. 4. This statement is false. The process of meiosis was not understood by the scientific community during Mendel’s lifetime. Mendel came to understand his laws of segregation and independent assortment through his meticulous breeding of pea plants with distinct observable traits. 5. An organism can have the genotype for an inherited genetic disease or condition, but never develop that condition.
The ____ is a single layer of parenchyma cells that give rise to muticellular lateral roots
a. endodermis b. periderm c. cortex d. vascular cambium e. pericycle
Photoperiodism requires
A. increased turgor pressure. B. a photoreceptor called phytochrome. C. a biological clock which can measure time. D. protease inhibitors. E. a biological clock which can measure time and a photoreceptor called phytochrome only are correct.
An earthquake hits a small island. All but a few individuals of a lizard species are eliminated in this catastrophe, and an allele is lost from the population. This is an instance of __________.
a. the bottleneck effect b. the founder effect c. gene flow d. mutation e. natural selection