The purpose of the study was to examine how integrated science and disciplinary literacy instruction influenced the quality of science informational text produced by first-grade students and student perceptions these young children held about scientists. The disciplinary literacy instruction took place over the course of 8 weeks (three 20-30-min lessons/week) and incorporated reading, writing, speaking, and listening as literacy tools to make sense of science content. A single-subject design (N = 76) using a paired sample t test was used to compare results of the scores from the informational text writing samples using a writing rubric and the "Draw-a-Scientist Test." Results revealed that students were able to produce higher-quality science informational texts in all areas being examined on the weighted writing rubric. However, the perceptions the first graders had regarding scientists remained essentially unchanged from beginning to end of the study. Implications for these findings are discussed. Educators should consider disciplinary literacy instruction as a way to support young children in learning to write science informational texts effectively.