Me fill in the bank. carbon (c) appears in the second row of the periodic table and has bonding electrons in its valence shell. carbon electrons to satisfy its valence shell. so carbon can form four bonds with other atoms, each bond consisting of one of carbon's electrons and one of the bonding atom's electrons. organic chemicals get their diversity from the many different ways carbon can bond to other atoms. the simplest organic chemicals, called , contain only carbon and hydrogen atoms; the simplest hydrocarbon, methane, contains a single carbon atom bonded to four hydrogen atoms: carbon can also bond with other carbon atoms! the uniqueness of carbon comes from the fact that it can bond to many different ways: it can form long chains, branched chains, and rings. finally, carbon atoms can in addition to single carbon-carbon bonds. four double and triple bonds eight hydrocarbons itself

This is due ! matching pairs of chromosomes from parents are called a. homologous chromosomes b. heterozygous chromosomes c. herterogenes d. homologous bands

Interpret the model. a three-part model with black right-arrows between the parts. left part: a large green apple-shaped component with a w-shaped indentation centered on top. a small blue apple-slice shape sits above the left indentation and an arrow points from the shape to the indentation. a small purple apple-slice shape and arrow sit above the right indentation and an arrow points from the shape to the indentation. middle part: a large green apple-shaped component with a square indentation centered on top. sitting in the left side of the indentation is a blue apple-slice shape with a flat bottom, fused to a purple apple-slice shape with a flat bottom on the right side of the indentation. right part: a large green apple-shaped component with a w-shaped indentation centered on top. an up-arrow is centered above the indentation pointing to a fused blue and purple apple-slice-shaped flat-bottom component sitting above the indentation. assigne "true" or "false" to the end of each statement. the model shows a shape change occurring in the enzyme after the substrate is bound in the active site. t/fthere are two products in this model. t? f there are three substrates in this model. t/f the model shows two different enzymes. t/f

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?